51681885 has 8 divisors (see below), whose sum is σ = 82691040. Its totient is φ = 27563664.

The previous prime is 51681871. The next prime is 51681893. The reversal of 51681885 is 58818615.

It is a happy number.

51681885 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51681885 - 2¹⁷ = 51550813 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1722715 + ... + 1722744.

It is an arithmetic number, because the mean of its divisors is an integer number (10336380).

Almost surely, 2^51681885 is an apocalyptic number.

It is an amenable number.

51681885 is a deficient number, since it is larger than the sum of its proper divisors (31009155).

51681885 is a wasteful number, since it uses less digits than its factorization.

51681885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3445467.

The product of its digits is 76800, while the sum is 42.

The square root of 51681885 is about 7189.0114063062. The cubic root of 51681885 is about 372.4884250866.

The spelling of 51681885 in words is "fifty-one million, six hundred eighty-one thousand, eight hundred eighty-five".